GI disturbances, nausea (accompanied w/ headache, anorexia & vomiting), unpleasant metallic taste, diarrhea, dry mouth, furred tongue, glossitis & stomatitis. Peripheral neuropathy (numbness or tingling in the extremities & epileptiform seizures); weakness, dizziness, ataxia, drowsiness, insomnia & mood changes, depression or confusion. Temporary moderate leucopenia; urethral discomfort, darkening of urine. Thrombophlebitis (IV).